I've posted about this place before. Please pardon the re-visit.
It's a World Heritage site, and was the inspiration for the James Bond show Skyfall.
They didn't actually film there, but used the island as a guide for the feel of the set they constructed.
https://www.instagram.com/p/CT2n-mloM6P/?utm_medium=copy_link
I think this is the entrance to the mine.